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Thread: tRFC Memory Question

  1. #1
    Join Date
    Jan 2010

    Cool tRFC Memory Question

    Can the tRFC refresh cycle time be to high? Mine is set at 72 on auto.

    Gigabye EP45-UD3P rev. 1.6
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  2. #2
    Chike is offline Senior Member
    Join Date
    Jun 2009

    Default Re: tRFC Memory Question

    If it is set by auto it is set according to manufacturer spec that are programed to SPD.
    However, usually much lower is possible (close to tRFC for DDR-800) with the higher voltage that is required for higher DDR rates.

    Of course there is no point changing it if there is no gain in bandwitdh or lower latencies.

  3. #3
    profJim's Avatar
    profJim is online now Chief Munchkin + moderator
    Join Date
    Dec 2008
    Tacoma, WA. [USA]

    Default Re: tRFC Memory Question

    If you post the information from steps 2, 3 and 4 from this post, we can help you optimize your bios settings for maximum memory performance.

    Have you run any stability/stress tests with your current setup? If yes, which tests and how long did each test run?
    Q9650 @ 4.10GHz [9x456MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
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    E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
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  4. #4
    Join Date
    Jan 2010

    Default Re: tRFC Memory Question

    A tRC (Row Cycle Time) of 72 seems high to me though. I can run my DDR3 on 1333Mhz with a tRC of 27 (24h Prime95 'Blend' stable). Default is 33 for me (OCZ3G1600LV4GK).

    /edit: oops, you were talking about tRFC..
    AMD Phenom II X4 955 Black Edition | Scythe Mugen 2 Rev. B | Gigabyte GA-770TA-UD3 | OCZ OCZ3G1600LV4GK (4GB) | Club3D HD5850 | Intel SSDSA2MH080G2R5 (80GB) | Corsair TX650W

  5. #5
    Join Date
    Feb 2010
    Birmingham,Great Britain

    Default Re: tRFC Memory Question

    seems fine to me at 72,mine run at 100 on auto but ive manually set it to 88
    Gigabyte ex58-ud5 f12 bios
    Intel i7 920 d0 @3.8ghz 24/7-normal cpu voltage 1.18750v/c1e/turbo/multi threading enabled
    Ocz reaper DDR3 PC3-14400 (1800MHz) 3x2gb (OCZ3RPR1800LV6GK) 8-8-8-24-1t-@1.64v-1.3qpi
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    1050w psu
    Nzxt lexa case <=3.8ghz overclock template

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